Everyone mark your calendar as NASA's Upper Atmosphere Research Satellite may crash back to earth at the end of this week. The exact date and time is still TBD, but early estimates suggest Friday will be the big day.

Most of the satellite will burn up in the earth's atmosphere, but approximately 26 pieces may survive re-entry. Make sure you have your camera ready as this flaming wreckage will put on quite a show. And don't worry about being hit by the falling pieces like Lottie Williams. NASA estimates there's a 1 in 3200 chance that debris from UARS will hit someone.